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You searched for: subject:"Global Positioning System"
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[texts]Global Positioning System - Lexie and Tony
Stuff.
Keywords: GPS; global positioning system
Downloads: 78
[texts]Analytical estimation of carrier multipath bias on GPS position measurements (Volume NIST Technical Note 1366) - Volk, C. Michael; Levine, Judah.

Keywords: Global Positioning System
Downloads: 27
[texts]Global positioning system receivers and relativity (Volume NIST Technical Note 1385) - Ashby, Neil; Weiss, Marc.

Keywords: Global Positioning System
Downloads: 39
[texts]Positioning with GPS-1985 : proceedings : First International Symposium on Precise Positioning with the Global Positioning System, Rockville, Maryland, April 15-19, 1985 - International Symposium on Precise Positioning with the Global Positioning System (1st : 1985 : Rockville, Md.)
"Sponsored by: International Union of Geodesy and Geophysics, International Association of Geodesy; U.S. Department of Defense, Defense Mapping Agency; U.S. Department of Commerce, National Oceanic and Atmospheric Administration, in cooperation with American Society of Civil Engineers."
Keywords: Global Positioning System; GPS
Downloads: 281
[texts]Accuracy of shipborne kinematic GPS surveying - Grinker, Barry.;Clynch, James R.
Thesis advisor, J.R. Clynch
Keywords: Global Positioning System
Downloads: 194
[texts]Positioning with GPS-1985 : proceedings : First International Symposium on Precise Positioning with the Global Positioning System, Rockville, Maryland, April 15-19, 1985 - International Symposium on Precise Positioning with the Global Positioning System (1st : 1985 : Rockville, Md.)
"Sponsored by: International Union of Geodesy and Geophysics, International Association of Geodesy; U.S. Department of Defense, Defense Mapping Agency; U.S. Department of Commerce, National Oceanic and Atmospheric Administration, in cooperation with American Society of Civil Engineers."
Keywords: Global Positioning System; GPS
Downloads: 168
[texts]Evaluation of absolute positioning using the Defense Mapping Agency's GASP program - Bredthauer, Dennis.;Clynch, James R.
Thesis advisor, J.R. Clynch
Keywords: Geographical positions; Global Positioning System
Downloads: 52
[texts]Characterization of the clock in a new inexpensive GPS receiver : the Magnavox MX4200 - Pardo, Manuel.;Clynch, James R.
Thesis advisor, James R. Clynch
Keywords: Oscillators, crystal; Global positioning system
Downloads: 73
[texts]Satellite positioning system : work group report - United States. Bureau of Land Management. Satellite Positioning System Work Group
Cover title: Satellite positioning systems, a report to the director
Keywords: Global Positioning System; Artificial satellites in surveying
Downloads: 116
[texts]High latitude aspects of a differential GPS aircraft landing system - Clynch, James R.
Title from cover
Keywords: GLOBAL POSITIONING SYSTEM; HIGH LATITUDES; AIRCRAFT LANDINGS
Downloads: 44
[movies]How Global Positioning System Works
In this NASA video segment a NASA expert explains the inner workings of the Global Positioning System (GPS). Learn more about trilateration and how four satellites work together to identify exact locations on Earth with the help of a two-dimensional model.
Keywords: satellite; global positioning system; GPS; technology; aviation
Downloads: 493
[texts]Real time differential GPS positioning capabilities : report - United States. Bureau of Land Management. Branch of Cadastral Survey
"December 23, 1992."
Keywords: Global Positioning System; Artificial satellites in navigation
Downloads: 85
[texts]Development of a Linear Stirling System Model with Varying Heat Inputs - Regan, Timothy F.
The linear model of the Stirling system developed by NASA Glenn Research Center (GRC) has been extended to include a user-specified heat input. Previously developed linear models were limited to the Stirling convertor and electrical load. They represented the thermodynamic cycle with pressure factors that remained constant. The numerical values of the pressure factors were generated by linearizing GRC's nonlinear System Dynamic Model (SDM) of the convertor at a chosen operating point...
Keywords: GLOBAL POSITIONING SYSTEM; SIGNAL PROCESSING; PULSE COMMUNICATION; PATENTS
Downloads: 166
[texts]An optical frequency comb tied to GPS for laser frequency/wavelength calibration (Volume 115) - Stone, Jack A.
Journal of Research of the National Institute of Standards and Technology
Keywords: laser wavelength calibration; global positioning system; GPSDO; laser frequency calibration
Downloads: 181
[texts]Interference mitigation for GPS based attitude determination - Markel, Matthew David
http://uf.catalog.fcla.edu/uf.jsp?st=UF028821579&ix=pm&I=0&V=D&pm=1
Keywords: Global Positioning System; Artificial satellites--Attitude control systems; Adaptive antennas
Downloads: 30
[texts]A Feasibility Study to Control Airfoil Shape Using THUNDER - Pinkerton, Jennifer L.
The objective of this study was to assess the capabilities of a new out-of-plane displacement piezoelectric actuator called thin-layer composite-unimorph ferroelectric driver and sensor (THUNDER) to alter the upper surface geometry of a subscale airfoil to enhance performance under aerodynamic loading. Sixty test conditions, consisting of combinations of five angles of attack, four dc applied voltages, and three tunnel velocities, were studied in a tabletop wind tunnel...
Keywords: DIRECTORIES; GEODYNAMICS; GLOBAL POSITIONING SYSTEM; EPHEMERIS TIME; PERSONNEL
Downloads: 83
[texts]Design and evaluation of an integrated, self-contained GPS/INS shallow-water AUV navigation system (SANS) - Walker, Randy G.
"June 1996."
Keywords: Remote submersibles; Kalman filtering; Underwater navigation; Global Positioning System
Downloads: 136
[movies]NASA SCI Files - How Pilots Use GPS - NASA LaRC Office of Education
Second segment of NASA Sci Files The Case of the Technical Knockout explaining how pilots use GPS and the other uses for GPS.
Keywords: NASA SciFiles; Maps; Pilots; GPS; Global Positioning System; The Case of the Technical Knockout
Downloads: 70
[movies]NASA Destination Tomorrow - DT11 - GPS - NASA LaRC Office of Education
NASA Destination Tomorrow Segment describing how pilots, drivers, hikers, seismologists, and the military use Global Positioning Systems (GPS).
Keywords: How It Works; Johnny Alonso; GPS; Global Positioning System; Dr. Kevin Dutton
Downloads: 73
[texts]An improved method for mapping oyster bottom using a global positioning system and an acoustic profiler (Volume v 11 (1992))

Keywords: An improved method for mapping oyster bottom using a global positioning system and an acoustic profiler
Downloads: 26
[texts]Intermediate Fidelity Closed Brayton Cycle Power Conversion Model - Lavelle, Thomas M.
This paper describes the implementation of an intermediate fidelity model of a closed Brayton Cycle power conversion system (Closed Cycle System Simulation). The simulation is developed within the Numerical Propulsion Simulation System architecture using component elements from earlier models. Of particular interest, and power, is the ability of this new simulation system to initiate a more detailed analysis of compressor and turbine components automatically and to incorporate the overall result...
Keywords: OIL FIELDS; REMOTE SENSING; GLOBAL POSITIONING SYSTEM; RADARSAT; SUBSIDENCE; SURVEYS; COMPACTING; TIME SERIES ANALYSIS
Downloads: 81
[texts]TopMaker: A Technique for Automatic Multi-Block Topology Generation Using the Medial Axis - Rigby, David L
A two-dimensional multi-block topology generation technique has been developed. Very general configurations are addressable by the technique. A configuration is defined by a collection of non-intersecting closed curves, which will be referred to as loops. More than a single loop implies that holes exist in the domain, which poses no problem. This technique requires only the medial vertices and the touch points that define each vertex...
Keywords: ALGORITHMS; STATISTICAL TESTS; INTERPOLATION; DIGITAL ELEVATION MODELS; PACIFIC ISLANDS; IMAGING TECHNIQUES; GLOBAL POSITIONING SYSTEM
Downloads: 69
[texts]Validating the Usefulness of Combined Japanese GMS Data For Long-Term Global Change Studies - Simpson, James J
The primary objectives of the Geostationary Meteorological Satellite (GMS)-5 Pathfinder Project were the following: (1) to evaluate GMS-5 data for sources of error and develop methods for minimizing any such errors in GMS-5 data; (2) to prepare a GMS-5 Pathfinder data set for the GMS-5 Pathfinder Benchmark Period (1 July 95 - 30 June 96); and (3) show the usefulness of the improved Pathfinder data set in at least one geophysical application...
Keywords: GLOBAL POSITIONING SYSTEM; MAGNETOMETERS; NAVIGATION SATELLITES; ATTITUDE (INCLINATION); MULTISENSOR FUSION; KALMAN FILTERS
Downloads: 81
[texts]Software Construction and Analysis Tools for Future Space Missions - Lowry, Michael R
NASA and its international partners will increasingly depend on software-based systems to implement advanced functions for future space missions, such as Martian rovers that autonomously navigate long distances exploring geographic features formed by surface water early in the planet's history. The software-based functions for these missions will need to be robust and highly reliable, raising significant challenges in the context of recent Mars mission failures attributed to software faults...
Keywords: GLOBAL POSITIONING SYSTEM; ORBIT DETERMINATION; SPIN STABILIZATION; REAL TIME OPERATION; AMPLIFICATION; SIGNAL RECEPTION; APOGEES; PERIGEES
Downloads: 76
[texts]A Summary of Ambient Air at John F. Kennedy Space Center with a Comparison to Data from the Florida Statewide Monitoring Network (1983-1992) - Drese, John H
The EPA criteria air pollutants were monitored at Kennedy Space Center (KSC) since 1983 to comply the prevention of significant deterioration requirements under the Clean Air Act amendments passed by Congress in 1977 and 1990. Monitoring results show that monthly maximum 24-hour total suspended particulates decreased from 144.6 micograms/cu m in 1988 to 73.0 micrograms/cu m in 1991 and increased to 149.3 micrograms/cu m in 1992...
Keywords: GEODYNAMICS; GLOBAL POSITIONING SYSTEM; CONFERENCES; GEOPHYSICS; GEODESY; PLANET EPHEMERIDES; EARTH ROTATION; CALIBRATING; STANDARDIZATION
Downloads: 78
[texts]On-the-Go DigitalSoil Mapping for Precision Agriculture - El-Sayed Ewis Omran
The objectives of precision agriculture are to increase crop production profitability, improve product quality, and protect the environment. One of the first and most important areas in which precision agriculture has been applied is in managing the variability in soil properties, which is essential for the decision-making process. The success of precision agriculture depends strongly upon highly efficient and reliable methods for gathering and processing site-specific field information...
Keywords: Precision Farming; Geostatistics; Pedometrics; Remote Sensing; Global Positioning System; Soil Mapping; Soil Properties
Downloads: 16
[texts]Production Support Flight Control Computers: Research Capability for F/A-18 Aircraft at Dryden Flight Research Center - Carter, John F
NASA Dryden Flight Research Center (DFRC) is working with the United States Navy to complete ground testing and initiate flight testing of a modified set of F/A-18 flight control computers. The Production Support Flight Control Computers (PSFCC) can give any fleet F/A-18 airplane an in-flight, pilot-selectable research control law capability. NASA DFRC can efficiently flight test the PSFCC for the following four reasons: (1) Six F/A-18 chase aircraft are available which could be used with the PS...
Keywords: DATA ACQUISITION; GEODYNAMICS; GLOBAL POSITIONING SYSTEM; INFORMATION SYSTEMS; INFORMATION TRANSFER; INTERNATIONAL COOPERATION; BUREAUS (ORGANIZATIONS); EARTH ROTATION
Downloads: 144
[texts]Vehicle Tracing and Accident Management System - Sarvani Kambhampati,KoteswaraRao Ponnuru,
The main aim of the work is to design and develop an advanced vehicle tracing and management system in the real time environment. The user can send a STATUS message from his cell phone (POS) and as soon as the GSM module gets the message, it will immediately send the details of the locations like the latitude and the longitude using GPS module. So the user can get to know the exact location of the vehicle...
Keywords: GPS (Global Positioning System); GSM (Global Service for Mobile Applications); SMS (Short Message Service); Microcontroller
Downloads: 15
[texts]Aircraft Conceptual Design and Risk Analysis Using Physics-Based Noise Prediction - Olson, Erik D.
An approach was developed which allows for design studies of commercial aircraft using physics-based noise analysis methods while retaining the ability to perform the rapid trade-off and risk analysis studies needed at the conceptual design stage. A prototype integrated analysis process was created for computing the total aircraft EPNL at the Federal Aviation Regulations Part 36 certification measurement locations using physics-based methods for fan rotor-stator interaction tones and jet mixing ...
Keywords: NAVIGATION; GLOBAL POSITIONING SYSTEM; RECEIVERS; GEOSYNCHRONOUS ORBITS; HIGH ALTITUDE; SYNCHRONOUS PLATFORMS; NAVIGATORS; STEADY STATE; SENSITIVITY ANALYSIS
Downloads: 127
[texts]Reverse Micelle Based Synthesis of Microporous Materials in Microgravity - Dutta, Prabir K
Microporous materials include a large group of solids of varying chemical composition as well as porosity. These materials are characterized by channels and cavities of molecular dimensions. The framework structure is made up of interconnecting T-O-T' bonds, where T and T' can be Si, Al, P, Ga, Fe, Co, Zn, B and a host of other elements. Materials with Si-O-Al bonding in the framework are called zeolites and are extensively used in many applications...
Keywords: GLOBAL POSITIONING SYSTEM; ALGORITHMS; POSITIONING; RANGEFINDING; TRANSMITTER RECEIVERS; INTERCALIBRATION; DEEP SPACE; SIMULATION; NAVIGATION
Downloads: 130
[texts]Comparison of Cirrus Cloud Models: A Project of the GEWEX Cloud System Study (GCSS) Working Group on Cirrus Cloud Systems - Starr, David O'C.
The GEWEX Cloud System Study (GCSS, GEWEX is the Global Energy and Water Cycle Experiment) is a community activity aiming to promote development of improved cloud parameterizations for application in the large-scale general circulation models (GCMs) used for climate research and for numerical weather prediction. The GCSS strategy is founded upon the use of cloud-system models (CSMs). These are ''process'' models with sufficient spatial and temporal resolution to represent individual cloud elemen...
Keywords: ATOMIC PHYSICS; CLOCKS; LASER COOLING; TECHNOLOGY UTILIZATION; CARRIER FREQUENCIES; GLOBAL POSITIONING SYSTEM; INTERNATIONAL SPACE STATION; MICROGRAVITY
Downloads: 82
[texts]Active Control of Aerodynamic Noise Sources - Reynolds, Gregory A
Aerodynamic noise sources become important when propulsion noise is relatively low, as during aircraft landing. Under these conditions, aerodynamic noise from high-lift systems can be significant. The research program and accomplishments described here are directed toward reduction of this aerodynamic noise. Progress toward this objective include correction of flow quality in the Low Turbulence Water Channel flow facility, development of a test model and traversing mechanism, and improvement of ...
Keywords: FLIGHT TESTS; TRAJECTORY MEASUREMENT; TRAJECTORIES; FILTRATION; GLOBAL POSITIONING SYSTEM; SENSORS; DATA SYSTEMS
Downloads: 79
[texts]The FERRUM Project: Experimental Transition Probabilities of [Fe II] and Astrophysical Applications - Hartman, H.
We report on experimental transition probabilities for thirteen forbidden [Fe II] lines originating from three different metastable Fe II levels. Radiative lifetimes have been measured of two metastable states by applying a laser probing technique on a stored ion beam. Branching ratios for the radiative decay channels, i.e. M1 and E2 transitions, are derived from observed intensity ratios of forbidden lines in astrophysical spectra and compared with theoretical data...
Keywords: AUTONOMOUS NAVIGATION; GLOBAL POSITIONING SYSTEM; FORMATION FLYING; POSITION ERRORS; ACCURACY; CROSSLINKING; HIGH ALTITUDE; EARTH ORBITS
Downloads: 87
[texts]Multi-Disciplinary Design Optimization Using WAVE - Irwin, Keit
The current preliminary design tools lack the product performance, quality and cost prediction fidelity required to design Six Sigma products. They are also frequently incompatible with the tools used in detailed design, leading to a great deal of rework and lost or discarded data in the transition from preliminary to detailed design. Thus, enhanced preliminary design tools are needed in order to produce adequate financial returns to the business...
Keywords: INSTRUMENT APPROACH; GLOBAL POSITIONING SYSTEM; FLIGHT TESTS; COLLISIONS; AIRPORTS; SPACING; SURVEILLANCE
Downloads: 82
[texts]Properties of a Formal Method for Prediction of Emergent Behaviors in Swarm-based Systems - Rouff, Christopher
Autonomous intelligent swarms of satellites are being proposed for NASA missions that have complex behaviors and interactions. The emergent properties of swarms make these missions powerful, but at the same time more difficult to design and assure that proper behaviors will emerge. This paper gives the results of research into formal methods techniques for verification and validation of NASA swarm-based missions...
Keywords: GLOBAL POSITIONING SYSTEM; SIGNAL DETECTION; NAVIGATORS; RECEIVERS; TECHNOLOGY UTILIZATION; SENSITIVITY; ECCENTRIC ORBITS; DOPPLER EFFECT; ALGORITHMS
Downloads: 82
[texts]A lifting surface computer code with jet-in-crossflow interference effects. Volume 1: Theoretical description - Furlong, K. L.
A method is proposed to combine a numerical description of a jet in a crossflow with a lifting surface panel code to calculate the jet/aerodynamic-surface interference effects on a V/STOL aircraft. An iterative technique is suggested that starts with a model for the properties of a jet/flat plate configuration and modifies these properties based on the flow field calculated for the configuration of interest...
Keywords: CALIBRATING; CHARGED PARTICLES; DEEP SPACE NETWORK; IONOSPHERIC COMPOSITION; IONOSPHERIC ELECTRON DENSITY; ACCURACY; GLOBAL POSITIONING SYSTEM; NAVIGATION
Downloads: 106
[texts]G.P.S. use in EHV and HVDC Transmission Line Protection - Rakesh A. Dafde, Prof. Chetan M. Bobade
This paper presents a new technique G.P.S. (global positioning system) for EHV and HVDC transmission line protection. In this scheme, the relay restrains a fault transient detection system relay together with a communication system such as SCADA system. Relays are located at each bus bar in a transmission line network. These relay detect the fault and generated high transient signals and trace the time instant corresponding to different fault occurs at bus bar and it generate initial travelling ...
Keywords: Global Positioning System; Possible Cause of fault; travelling wave; transmission line protectio
Downloads: 9
[texts]Multidisciplinary Design Optimization of a Full Vehicle with High Performance Computing - Yang, R. J.
Multidisciplinary design optimization (MDO) of a full vehicle under the constraints of crashworthiness, NVH (Noise, Vibration and Harshness), durability, and other performance attributes is one of the imperative goals for automotive industry. However, it is often infeasible due to the lack of computational resources, robust simulation capabilities, and efficient optimization methodologies. This paper intends to move closer towards that goal by using parallel computers for the intensive computati...
Keywords: GLOBAL POSITIONING SYSTEM; GREENLAND; LAND ICE; POSITION (LOCATION); ELEVATION ANGLE; PARAMETERIZATION; RANDOM WALK; RECEIVERS
Downloads: 145
[texts]An Automated Traffic Accident Detection and Alarm Device - M Rajendra Prasad, P Aswani Kumar
The purpose of this work is to find the vehicle where it is and also you can stop that vehicle means after sending a message block you vehicle to your system which is placed inside of vehicle will get hold down there itself, until and unless authorized one comes and giving security code to that system and also most of the times we may not able to find accidents because we donĂ¢t know where accident will happen, in order to give treatment for injured people first we need to know that where that h...
Keywords: GPS (Global Positioning System); GSM (Global Service for Mobile Applications); SMS (Short Message Service); Microcontroller
Downloads: 371
[texts]Space Station Freedom Integrated Research and Development Growth - Meredith, Barry D.
Space Station Freedom is designed to be an Earth-orbiting, multidiscipline research and development (R&D) facility capable of evolution to accomodate a variety of potential uses. One evolution scenario is growth to an enhanced R&D facility. In support of the Space Station Freedom Program Preliminary Design Review (PDR), the NASA Langley Research Center Space Station Office is analyzing growth requirements and evaluating configurations for this R&D utilization...
Keywords: COMPUTER PROGRAMS; KITS; GLOBAL POSITIONING SYSTEM; MANUALS; ATLANTIC OCEAN; ENGINEERS; RECEIVERS
Downloads: 63
[texts]An RSS Based Localization Algorithm in Cellular Networks
Localization in cellular networks has attractedsignificant interest in responding to localization accuracydriven by the emergency services (U.S. Enhanced 911) and thesecurity applications. This study focuses on the Mobile Station(MS) localization employing the measurements of the detectedBase Stations (BSs) Received Signal Strength (RSS). Alocalization algorithm based only on measurements of BSRSS and BS basic information is proposed...
Keywords: Localization; positioning; Received Signal Strength; cellular networks; Global Positioning System (GPS)
Downloads: 11
[texts]The Electrical and Thermal Conductivity of Woven Pristine and Intercalated Graphite Fiber-Polymer Composites - Gaier, James R.
A series of woven fabric laminar composite plates and narrow strips were fabricated from a variety of pitch-based pristine and bromine intercalated graphite fibers in an attempt to determine the influence of the weave on the electrical and thermal conduction. It was found generally that these materials can be treated as if they are homogeneous plates. The rule of mixtures describes the resistivity of the composite fairly well if it is realized that only the component of the fibers normal to the ...
Keywords: GLOBAL POSITIONING SYSTEM; RADIO OCCULTATION; EARTH LIMB; REFRACTIVITY; TROPOSPHERE; MICROSATELLITES; RADIO RECEIVERS; SKEWNESS; ANNUAL VARIATIONS
Downloads: 118
[movies]NASA SCI Files - How Does GPS Work - NASA LaRC Office of Education
Fourth segment of NASA Sci Files The Case of the Technical Knockout explaining how GPS receivers work with satellites to determine an exact location. This segment explains the concept of trilateration in two and three dimensions.
Keywords: NASA SciFiles; GPS; Global Positioning System; Satellites; Trilateration; The Case of the Technical Knockout
Downloads: 391
[texts]Using EEG To Detect and Monitor Mental Fatigue - Montgomery, Leslie
This project aims to develop EEG-based methods for detecting and monitoring mental fatigue. Mental fatigue poses a serious risk, even when performance is not apparently degraded. When such fatigue is associated with sustained performance of a single type of cognitive task it may be related to the metabolic energy required for sustained activation of cortical areas specialized for that task. The objective of this study was to adapt EEG to monitor cortical energy over a long period of performance ...
Keywords: GLOBAL POSITIONING SYSTEM; REMOTE SENSING; SEA ICE; CRYOGENIC EQUIPMENT; RECEIVERS; WATER; SIGNAL REFLECTION; BACKSCATTERING; AIRBORNE EQUIPMENT
Downloads: 151
[texts]Future uses of satellite technology in aviation : hearing before the Subcommittee on Aviation of the Committee on Public Works and Transportation, House of Representatives, One Hundred Third Congress, first session, July 28, 1993 - United States. Congress. House. Committee on Public Works and Transportation. Subcommittee on Aviation
Includes bibliographical references
Keywords: Navigation (Aeronautics) -- United States; Global Positioning System; Artificial satellites in navigation -- United States
Downloads: 1,065
[texts]Scalar gain interpretation of large order filters - Mason, Paul A. C.
A technique is developed which demonstrates how to interpret a large fully-populated filter gain matrix as a set of scalar gains. The inverse problem is also solved, namely, how to develop a large-order filter gain matrix from a specified set of scalar gains. Examples are given to illustrate the method.
Keywords: EPHEMERIDES; GLOBAL POSITIONING SYSTEM; NAVIGATION SATELLITES; ORBIT CALCULATION; RANGEFINDING; TDR SATELLITES; BEACONS; BROADCASTING; RECEIVERS
Downloads: 91
[texts]Advanced Guidance and Control Project for Reusable Launch Vehicles - Hanson, John M
The goals of this project are to significantly reduce the time and cost associated with guidance and control design for reusable launch vehicles, and to increase their safety and reliability. Success will lead to reduced cycle times during vehicle design and to reduced costs associated with flying to new orbits, with new payloads, and with modified vehicles. Success will also lead to more robustness to unforeseen circumstances in flight thereby enhancing safety and reducing risk...
Keywords: GLOBAL POSITIONING SYSTEM; IMAGING TECHNIQUES; IONOSPHERIC PROPAGATION; ASSIMILATION; RADIO OCCULTATION; SCINTILLATION; UNIQUENESS
Downloads: 128
[texts]Obstacle Detection Algorithms for Rotorcraft Navigation - Kasturi, Rangachar
In this research we addressed the problem of obstacle detection for low altitude rotorcraft flight. In particular, the problem of detecting thin wires in the presence of image clutter and noise was studied. Wires present a serious hazard to rotorcrafts. Since they are very thin, their detection early enough so that the pilot has enough time to take evasive action is difficult, as their images can be less than one or two pixels wide...
Keywords: GLOBAL POSITIONING SYSTEM; RECEIVERS; MICROPROCESSORS; ALGORITHMS; ATTITUDE (INCLINATION); OSCILLATORS; EXTRATERRESTRIAL RADIATION
Downloads: 96
[movies]NASA SCI Files - GPS - NASA LaRC Office of Education
NASA Sci Files segment explaining the Global Positions System and how it monitors and measures crustal movement
Keywords: NASA Sci Files; Earthquake; Global Positioning System; Stations; Satellites; Crustal Movement; Earth; Blind Fault; Computer Simulation; Slip Rate; Prediction; Displacement
Downloads: 89
[texts]Simulation of Fatigue Crack Initiation at Corrosion Pits With EDM Notches - Smith, Stephen W.
Uniaxial fatigue tests were conducted to compare the fatigue life of laboratory produced corrosion pits, similar to those observed in the shuttle main landing gear wheel bolt-hole, and an electro-discharged-machined (EDM) flaw. EDM Jaws are used to simulate corrosion pits during shuttle wheel (dynamometer) testing. The aluminum alloy, (AA 7050) laboratory fatigue tests were conducted to simulate the local stress level contained in the wheel bolt-hole...
Keywords: GLOBAL POSITIONING SYSTEM; RECEIVERS; PERIGEES; ORBIT DETERMINATION; ELLIPTICAL ORBITS; ASTRONAUTICS; SPACECRAFT INSTRUMENTS; NAVIGATION; SIGNAL RECEPTION; ATTITUDE (INCLINATION); CONTROLLERS
Downloads: 85
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